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v3.20.4

Loans - Additional Information (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 USD ($) payment | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) loan payment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Paycheck protection program | $ 208,900,000 |  |  |  |  |  |  |  | $ 208,900,000 |  |
Deferred loan costs | 1,700,000 |  |  |  |  |  |  |  | $ 1,700,000 |  |
Period of loan sold |  |  |  |  |  |  |  |  | 30 days |  |
Minimum period seldom held |  |  |  |  |  |  |  |  | 90 days |  |
Mortgage warehousing maximum pay off period |  |  |  |  |  |  |  |  | 30 days |  |
Nonaccrual interest income |  |  |  |  |  |  |  |  | $ 0 | $ 0 |
Non-accrual loans | 22,142,000 |  |  |  | $ 15,679,000 |  |  |  | 22,142,000 | 15,679,000 |
Non-performing TDRs | 2,600,000 |  |  |  |  |  |  |  | 2,600,000 |  |
TDR loans | $ 2,610,000 |  |  |  | 2,006,000 |  |  |  | $ 2,610,000 | 2,006,000 |
Restructured loan returned to accruing status number of Consecutive Payments of loan | payment | 6 |  |  |  |  |  |  |  | 6 |  |
Restructured loan reported in TDRs | $ 4,403,000 |  |  |  | 5,360,000 |  |  |  | $ 4,403,000 | 5,360,000 |
Specific reserves allocated to troubled debt restructuring | 0 |  |  |  |  |  |  |  | 0 |  |
Credit loss expense | 3,042,000 | $ 2,052,000 | $ 7,057,000 | $ 8,600,000 | $ 340,000 | $ 376,000 | $ 896,000 | $ 364,000 | 20,751,000 | 1,976,000 | $ 2,906,000
Minimum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans with an aggregate credit exposure | 1,000,000 |  |  |  |  |  |  |  | $ 1,000,000 |  |
Loans classified as TDR after a period |  |  |  |  |  |  |  |  | 90 days |  |
Minimum | Good Pass |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of consecutive years of profit for Good Pass Rating |  |  |  |  |  |  |  |  | 3 years |  |
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating |  |  |  |  |  |  |  |  | 5 years |  |
Number of years of Satisfactory Relationship with bank for Good Pass Rating |  |  |  |  |  |  |  |  | 5 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans with an aggregate credit exposure | 3,500,000 |  |  |  |  |  |  |  | $ 3,500,000 |  |
Loans classified as TDR after a period |  |  |  |  |  |  |  |  | 120 days |  |
Maximum | Satisfactory Pass |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating |  |  |  |  |  |  |  |  | 2 years |  |
CARES Act |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructured loan reported in TDRs | 126,700,000 |  |  |  |  |  |  |  | $ 126,700,000 |  |
Performing |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructured loan reported in TDRs | 1,800,000 |  |  |  |  |  |  |  | $ 1,800,000 |  |
Number TDRs returned to accrual status | loan |  |  |  |  |  |  |  |  | 1 |  |
Loans Purchased With Evidence of Credit Deterioration |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-accrual loans | 2,600,000 |  |  |  |  |  |  |  | $ 2,600,000 |  |
Non-performing TDRs | $ 991,000 |  |  |  |  |  |  |  | $ 991,000 |  |
Credit loss expense |  |  |  |  |  |  |  |  |  | 133,000 |
Allowances for loan losses |  |  |  |  |  |  |  |  |  | $ 0 |

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